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<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      let xhr = new XMLHttpRequest();
      xhr.open("GET", "http://www.liulongbin.top:3006/api/getbooks");
      xhr.send();
      xhr.onreadystatechange = function () {
        if (xhr.readyState === 4 && xhr.status === 200) {
          //   console.log(xhr.responseText); // 得到的是一个JSON格式的字符串
          let obj = JSON.parse(xhr.responseText); // 将JSON格式的字符串转换为JS对象
          console.log(obj);
        }
      };
    </script>
  </body>
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